Boring tool



Jan. 29, 1929. 1,700,654

F. R. STELZENMULLER BORING TOOL Fiied Dec. '7, 1927 INVENTOR 17m 1i. J'Zalzemwzz/lar ATTORNEY Patented Jan. 29, I929.

1 mm "RI. s'rELzENMunLEn, or: nELAwAivnA, NEW JERSEY. I

BoRInG'Too i @Applicatio'n filed December 7', 1927'. Serial No. 238,378. j

The present invention is concerned witha boring tool primarily designed for boring "square or other rectangular holes. v

object of the invention is'to provide a boring'tool in which an auger bit is associated I with apair of-milling cutters, the bit andcutters being: simultaneously driven in such a manner that the cutters rotate in the same direction, and following the bit into work to 10 be drilled produce asubstantially square or other rectangular out. The'axis of rotation I of the milling cutters is'of course at right angles to the axis of rotation of the auger'bit. "5 Other objects of the invention are to provide a toolof this character which will drilla square or rectangular opening, leaving only i a pair of extremely small fillets to be removed by hand.

Another'ob ject of the invention is toprovidea tool of this character of extremely simjfple, practical construction, which' will be rugged, durableand eflicient in use, and well suited tothe requirements of economical manufacture.

. 5 H With the above noted and other Objects in view; the invention consists in certain novel features [of construction and'combinations and arrangements of'parts, as will be more fullyhereinafter set forth and pointed out I in the claims. The invention may be more in any other desired manner. This stock at its lower end is provided with a pocket 11 receiving. a shaft 12, the shaft being held against rotation in the socket by a set screw 13. Mounted on the lower end of the shaft 12 is a hub 14 carrying an auger bit 15 provided with the usual threaded entering point Immediately above the hub 14 and prefer; ably fixedthereto, or to the shaft '12 is a bevelled gear 17. Another bevelled gear 18 is integral or rigid with the lower end of the s o k 1Q.

' right hand cutter.

- o rFic;E .j,

Asleeve 19 encircles the shaft1 2 between the gears 17 and 18, this sleeve being provided on opposite sides with radially projecting spindles 20 upon which millingcutters 21 are secured by nuts 22 or in any otherap p atemanner. y

.Theinner faces of the milling cutters 21 are for ned with internalbevelled gears 23 and 24 respectively meshing with the gears '18 and 19 respectively. r It will bej'noted that the left hand cutter'of'Fig. 1 at itsperiphery extends substantially to the surface-of the hub 14 and-stock 10, being internally cut awayat 25 defining an annular groove into which'the gear l8'projectsfor engagement with the gear teeth 23.-- This: cutter isalso annularly' grooved at 26 nearer its center to 1 accommodate the gear 17 in mesh with the I Theright hand cutter of Fig. 1 is-annularly grooved at 28 to provideclearance for the gear l8,'and the teeth 24 are forme'dfon on 5 of the sloping walls of this groove; r The milling cutters of Fig. 1 are of" such a size that the tool will bore a square hole while the cutters2l of Fig. 2 are elongated and are, adapted for cutting a relativelylong rectangularhole. 1

In operation, the stock 10. may be rotated in any desire'dti'nanner the vsharpthreaded entering point 16 of the auger bit is entered into the edge of a bore or any other suitable piece of work in which a hole is to be drilled. The auger bit 15 will follow the pointed end 16 into the wood, drilling a circular hole, the diameter of which is equal to the length of a ,side of the proposed square opening. Following the auger bit, milling cutters 21 rotating each in the same direction serve to mortise or bore a square opening.

In the'case of Fig. 2 the diameter of the hole cut by the auger bit 15 is equal to the shorter dimension of the elongated rectangular opening made by the milling cutters. In

enlarging the gear 18 and deepening the grooves 25 and 28. p

Various slight changes and alterations might be made in the general form and arrangement of the parts described Without de-. parting from the invention. Hen'ceI do not Wish to limit myself to the details set forth,

but shall consider myself at liberty to make such changes and alterations as fairly fall" laterally'from the sleeve, millingcutters on the spindles, and means operable from the shaft for rotating the cutters inthe same direction, said means comprising internal bevel gears onthe inner faces of the cutters :mesliing With bevel gears on the shaft.

'3. A boring toolof the class described in cluding a shaft, an auger bit mounted? thereon, a sleeve on the shaft, spindles projecting laterally from the sleeve, milling cutters on the sp-indles,and means operable from the shaft for rotating the cutters in the same direction, said means comprising internal bevel;

gears on the inner facesof the cutters meshing with bevel gears on the shaft, the inner faces of each cutter being .annularly grooved vtoprovide clearance for the driving gear of the other cutter. v 1

a 4:. A boring tool of theclass described including a shaft, an auger. bit mounted thereon, a sleeve on the shaft, spindles projecting laterally from the sleeve, milling cutters on the spindles, and means operable from the shaft for rotating the cutters-in the same direction, said means comprising internal bevel gears on the inner faces of the cutters meshing With bevel gears on the shaft, the bevel gears of the cutters being integral therewith and disposed in grooves in the'inner faces of the cutters.

on, asleeve onthe shaft, spindles projecting laterally from the; sleeve, milling cutters on the spindles, and means operable from the shaft for rotating the cutters in the same direction, said means comprising internal bevel gears on the inner faces of the cutters'meshing with bevel gears .on the shaft, the bevel gears of the cutters being integral therewith and disposed in grooves inthe' inner faces of the cutters, the peripheral edges of the cutters projecting inwardly andhousing said gears. j I a 6. A boring tool of the class described in cluding a shaft, an auger bit mounted there'- on, a sleeve on the shaft, spindlesprojecting laterally from the sleeve,'milling cutters on the spindles,- and means operable from the shaft for rotating the cutters in the same direction, said sleeve being square sided to provide bearing surfaces for the inner ends of the cut-ters. Signed at Lyndhurst in the county ofBergen and State of New Jersey this 5th day of twenty-seven.

,- FRED R. STELZENMULLER.

'75 December A. D. nineteen hundred and e a .7 7 5. -A boring tool of the class described ineluding a shaft, an anger bit mountedthere- 

